Marcus Gervais Beresford was the Church of Ireland Bishop of Kilmore, Elphin and Ardagh from 1854 to 1862 and Archbishop of Armagh and Primate of All Ireland from 1862 until his death.

The United Dioceses of Kilmore, Elphin and Ardagh is a diocese of the Church of Ireland located in central Ireland. It is in the ecclesiastical province of Armagh.